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Effects of Temperature, Relative Humidity and Moisture Content on Seed Longevity of Shrubby Russian Thistle （ Salsola vermiculata L,）

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Journal of Agricultural Science and Technology(B) 2013年第9期3卷 623-634页

作者： Abdoul Aziz Niane Paul Christiaan Struik Zewdie Bishaw International Center for Agricultural Research in the Dry Areas (ICARDA) Beirut Lebanon Centre for Crop Systems analysis Wageningen University AK Wageningen NL-6700 Netherlands

Salsola vermiculata is a highly palatable shrub and widely used in rangeland rehabilitation programs, but has short seed longevity. To identify the most cost effective storage method for S. vermiculata, experiments were carried out to test the effects of fruit bracts （wings）, temperature regimes, seed moisture and packaging methods on storage life. Seed samples were removed from storage at monthly intervals for testing and towards the end of the experiments samples were transferred from hermetic to ambient storage conditions and tested for germination. Experiment 1 continued for 1,140 days, Experiment 2 for 720 days. For de-winged seed, high moisture content increased seed longevity, suggesting that desiccation susceptibility is one of the causes of limited longevity in this species. Most longevity regression lines of winged seeds had negative intercepts suggesting increase in germination resulting from gradual dormancy-breaking. Drying and packaging alone increased longevity by 7.6 and 3.8 times in Experiments 1 and 2, respectively. Samples kept at lower temperature and lower moisture treatments survived longer under ambient conditions. Increased longevity by drying and vacuum packaging alone can provide simple, cost effective and environmentally friendly options for rangeland rehabilitation programs.

关键词： Salsola vermiculata L. seed storage vacuum packaging seed longevity probit analysis.

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